Pulverizer.



' J. E. BLAKE, DEOD.

R. E- BLAKE, EXEUUTRIX.

PULVERIZER.

APPLICATION FILED APR. 14, 1913.

Patented Dec. 9, 1913.

INVENTOR COLUMBIA PLANOFRAI'H cu, wmsmsurrm. n. Cv

E STATES PTNT @FFTGE,

JOHN E. BLAKE, DECEASED, LATE OF PIZITSBURGi'rI, PENNSYLVANIA, BY REBECCA E. BLAKE, EXECUTRIX,' 0E PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAKE CRUSHER AND PULVERIZER COMPANY, OF PITTSBURGH, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

PULVERIZER.

To all whom it may concern .3e it known that John E. BLAKE, dcceased, late a citizen of the United States, and residing in the city of Pittsburgh, in the county of Allegheny and State of Pennsylvania, did invent or discover new and useful Improvements in Pulvcrizcrs, of which the following is a specification.

The invention consists in new and useful improvements in rotary pulverizers for fuel and similar purposes.

The difficulty with pulverizers of this type has been the tendency of a portion of the unpowdered or unreduced particles of fuel to escape with the properly pulverized fuel, resulting in slower ignition, less complete combustion, loss of fuel values and an excess of ash. The present invention provides efficient means for overcoming this fault and for retaining the coarser grains or particles of material in the paddle zones until they are reduced to an impalpable powder.

In the accompanying drawings Figure 1 is a broken longitudinal section of a rotary pulverizer embodying the present invention and showing one of the pulvcrizing chambers and portions of the two adjoining pulverizing chambers, Fig. 2 is a perspective of the annular member which is preferably used in connection with the invention, and Fig. 3 is a reduced side elevation of a rotary pulverizer, the present invention being indicated in dotted lines as are also the pulverizing chambers and fan chamber.

The following is a detailed description of the drawings:

A represents a rotary pulverizer consisting of a horizontal, cylindrical casing con taining pulverizing chambers 1, 2 and S, and fan chamber 1.

B is a rotary shaft extending axially through the pulverizer and having mounted thereon in pulverizing chambers 1, 2 and 3 the paddles 5, and in the fan chamber 4t, the fan blades 6.

The fuel is introduced into pulverizing chamber 1 through a port, not shown and after progressing through the several pulverizing chambers 1, 2 and 3 and being reduced is discharged into the fuel pipe, not shown, from fan chamber 1, the suction of the fan drawing the fuel through the pulverizer. The various chambers are sepa- Specification of Letters Patent.

Application filed April 14, 1913.

Patented Dec. 9, 1913.

Serial No. 760,938.

rated by annular partitions 7 having a central opening or port concentric with the shaft B. In the present case said partitions are shown formed by a pair of slightly separated plates or flanges of the drums C, which form the individual chambers. Said drums are frequently severed diametrically, as shown at a, Fig. 1 to enable the pulverizcr chamber to be opened up, by swinging back or removing the top half, for access to the interior.

To prevent the unlnnvdcred elements from passing through from one chamber to the other and escaping into the fuel pipe the present invention provides lateral extensions orflanges extending from said annular partitions into said pulverizing chambers within the zone of travel of the paddles 5, partially inclosing an annular chamber in which said paddles travel. To provide such flanges and conveniently mounting the same an annular member D is provided, preferably made in two semi-annular parts for the sake of convenience. Said member is substantially T shape in cross section, the radial tin 10 being secured between the plates forming the annular partitions 7 while the lateral extensions 11 extend into the pulverizing chambers. The result of the provision of said lateral flanges is that the coarser particles or grains of fuel being treated in a pulverizing chamber are held in the zone of travel of the paddles until thoroughly reduced while the finely pulverized or powdered elements are drawn through the cent 'al openings in partitions 7 into the fan chamber and expelled into the fuel pipe.

that is desired to be claimed is 1. In a rotary pulverizer, the combination of a casing containing a fan chamber and pulverizing chambers separated by annular partitions, a rotary shaft extending axially through said chambers, fan blades mounted on said shaft in said fan chamber, paddles mounted on said shaft within said pulverizing chambers, and lateral extensions on said partitions extending into said pulverizing chambers within the zone of travel of said paddles.

2. In a rotary pulverizcr, the combination of a casing containing a fan chamber and PUlVGIlZUIg chambers contained in said casmg, a rotary shaft extending axially Signed at Pittsburgh, Pa., this 7th day of through said chambers, fan blades mounted April, 1913.

on said shaft in said fan chamber, paddles mounted on said shaft in said pulverizing chamber, and annular partitions separating said pulverizing chambers, said partitions having lateral extensions extending into said pulverizing chambers, for the purpose described.

REBECCA E. BLAKE, Emeoutrim "of J 07m E. Blake, deceased.

lVitnesses CHAS. T. EILENMEYER, H. lV. DOUGLASS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents, Washington, D. G. 

